Interior Normal Displacement
The Interior Normal Displacement node adds a normal displacement on an interior boundary and ensures that the pressure is noncontinuous here. Add this node from the Interior Conditions submenu. The pressure has a so-called slit condition on this boundary. The condition is very similar to the Interior Normal Acceleration condition simply having the acceleration given by (iω)2 times the displacement.
Interior Normal Displacement
Select a Type: Displacement (the default) or Inward displacement.
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For Displacement enter values for the components of the Displacement d0 (SI unit: m/s2).
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For Inward displacement enter the value of the Inward displacement dn (SI unit: m/s2) in the normal direction. Use a positive value for inward displacement or a negative value for outward displacement. The normal of the boundary points outward. The normal is depicted as a red arrow in the graphics window on the selected boundary.